package com.springcloud.configclient.consumer80.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

//手写负载均衡-轮询
@Component
public class MyLB implements LoadBalancer {
    private AtomicInteger atomicInteger = new AtomicInteger(0);
    //访问次数
    public final int getAndIncrement() {
        int current;
        int next;
        do {
            current = this.atomicInteger.get();
            next = current >= Integer.MAX_VALUE ? 0 : current + 1;
        } while (!this.atomicInteger.compareAndSet(current, next));
        System.out.println("#####第几次访问########"+next);
        return next;
    }
    //index=访问次数%集群数
    public ServiceInstance serviceInstance(List<ServiceInstance> serviceInstance) {
       int index= getAndIncrement()%serviceInstance.size();
       return serviceInstance.get(index);
    }
}
